nucleation

THEORY-1352: In Van Lange and Bergmann's model, human cooperation is readily sustained between individuals, above all in dyads, through precise reciprocity, empathy and a partner who cannot be excluded at no cost, and is fragile between groups: categorization alone yields mistrust and in-group favouritism by bounded reciprocity, observed out-group favouritism hardens it into distrust, and only negative interdependence, real or perceived, turns that into costly competition, aggression and hate, so that the processes that build in-group cooperation can fuel intergroup conflict

1 min read

Properties5
StatusProposed
Tagssocial-identity, moral-psychology, society-and-governance
SourceLIT-2002 — Human cooperation is strong among individuals but fragile between groups
CorroboratesCLAIM-547 — Cooperation within groups and the coexistence of groups are distinct targets that can trade off: in the group-selection rule of Nowak's five, b/c > 1 + n/m, cooperation spreads because a group that grows to size n splits and another group is driven extinct, so the mechanism that stabilizes cooperation inside groups works by removing groups; cooperation local to a group, the persistence of several groups whose interests are opposed, and concern for those outside one's group are three achievements, and none of them secures the next
Cited as “grounds” byARG-052 — Van Lange and Bergmann's model of intergroup cooperation does not establish that cooperation within groups and the coexistence of groups are distinct targets that can trade off: it shows that the processes building in-group cooperation can fuel conflict between groups, and says nothing on whether groups persist, go extinct or are owed impartial concern

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Source

Van Lange and Bergmann (2026), LIT-2002, pp. 547–555. Read in NOTE-1537.

What was actually shown

Nothing new. The paper assembles results from laboratory social dilemmas, minimal-group studies and field work, and proposes the stages. Its claims, with page references, are in the note. Two are worth separating:

  • “need not imply … any harmful behaviour towards outgroups” (p. 553). Favouritism is not harm.
  • “the same processes that can establish ingroup cooperation can also fuel intergroup conflict” (p. 554). Conformity and peer punishment push members to invest in a conflict.

What this does not say

  • That groups fail to persist, or go extinct. The model is about cooperation and conflict between groups, and CLAIM-547’s coexistence of groups is a further target.
  • That the cross-group-dyad remedy works. It is proposed, untested.

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